She lived from 1436 - 1467, and was wife of Holy Roman Emperor Friedrich III. This is a posthumous portrait.
This may be from the old Worldroots site, now the Artroots site's "History of Portugal" album. The Artroots site portions related to this site is here.
Eleonore of Portugal is portrayed here wearing late medieval dress. She is probably wearing a surcoat, an open sided garment left from the fourteenth century.
Keywords: 1468, Eleonore of Portugal, Habsburg family, Empress, straight long coiffure, high enclosing neckline, crown, surcoat, fur